For any $A.P.$,$T_{25} - T_{20} = \ldots \ldots \ldots$

  • A
    $5d$
  • B
    $5a$
  • C
    $5n$
  • D
    $S_5$

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Find the sum of the first $17$ terms of an $AP$ whose $4^{\text{th}}$ and $9^{\text{th}}$ terms are $-15$ and $-30$ respectively.

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With respect to the usual notations of an $A.P.$,if $T_{n} = 28$,$S_{n} = 144$,and $n = 9$,find the first term $a$.

The $n^{th}$ term of the $A.P.$ $5, 10, 15, 20, \ldots$ is....... (in $n$)

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